Improvement in expanding drills for well-boring



NrTED STATES PATENT OFFICE.

GEORGE F. OASE, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN EXPANDING DRILLS FOR WELL-BORING.

Specification forming part of Letters Patent No. 49,717, dated September5, 1865.

To all lwhom it may concern:

Be it known that I, GEORGE F. GAsE, of Brooklyn, in the county of Kingsand State of New York, have invented a new and useful Improvement inExpanding Drills for Artesian Vells; and I do hereby declare that thefollowin gis afull, clear, and exact description thereof, which willenable those skilled in the art to make and use the same, referencebeing had to the accompanying drawings, forming part of thisspecification, in which- Figure l represents an apparatus or implementmade according to my invention, the greater part thereof being shown insection.

Fig. 2 is a longitudinal section thereof at right angles to the sectionin Fig. l. Fig. 3 represents a modification thereof, partly in section.Fig. 4 is a longitudinal section at right angles to the view given inFig. 3. Fig. 5 is a plan or top view of Fig. l.

Similar letters of reference indicate corresponding parts.

The object of this invention is to produce an implement or apparatus bymeans of which the bottom of an Artesian well or any other part thereofcan be chambered out or enlarged in diameter; and it consists in a tubewhich carries in a diametrical chamber at its lower end a horizontaldrill capable of being driven outward beyond the periphery ot' the tubein order to cutaway the sides of the well when the tube which carries itis rotated.

A is a hollow cylinder, closed at thebottom, whose length is to be suchas to extend from the surface of the earth down to the place to bechambered out. This cylinder is to be rotated by any suitable means, asby a belt or coggearing, or by a crank. Such means are not here shown,because I do not claim any particular manner of applying them. Thebottom of the cylinder has a horizontal opening, E, made A clear acrossit on the line ofits diameter, to receive a drill or reaming-tool, D,whose upper Side has teeth cut thereon, as shown in the drawings. Anannular groove, H, is cut in the bottom ofthe cylinder, in its inside,which intersects the opening E on opposite sides.

B is a central shaft, extending the whole length of the tube A, andfitted on top with a crank, F. Its bottom carries a helix, I, whoseoutline is seen in dotted outline in Fig. 5, and

which revolves in said groove H, and consequently when in motion engagesthe teeth on the tool D and causes said tool to protrude beyond thecircumference of the tube when the crank is turned in one direction, andto be withdrawn when turned in the opposite direction. The bearing-pointof the shaft is in the solid part of the bottom of the cylinder, abovethe opening E. Vhen the tool D has been protruded beyond thecircumference of the tube it is evident that the revolution of the tubewill cause the sides of the well to be worn and cut away by the tool.The tube may be nearly equal to the diameter ofthe well, ifsuch tube sspecially provided for the operation deseribed; but the ordinarywelltubing, which is ot' much less diameter, may be used for thispurpose, in which case, iu tting the tool to its bottom, provisionshould be made not only for strengthening the bottom of such tubing, butalso for properly supporting the tool therein. When the tool D has beendriven out to its greatest extentthe advanced edge of the helix I comesagainst the broad tooth Gr of the tool, and the advance of the tool isstopped. So when it has been withdrawn into the tube the opposite edgeof the helix comes against the broad tooth G at the opposite end ofthetool, when its return movement ceases.

The modication of my invention shown in Figs. 3 and et consists indetaching the bottom of the tube H' from the rest of the tube, and inconnecting such bottom to the shalt B, so that they revolve together,and also in forming the helix I, which drives out the tool D, upon thelower edge ofthe tube. When thus arranged the revolution ofthe tubecauses the protruding end ofthe tool D to abrade and cut away the sidesof the well, as in the plan above described. When the helix has reachedthe blank space G', where the teeth on the upper side of the tool havebeen cut out, the advance of the tool ceases, but since, if the tool andthe helix were left in the position at which that advance places them,the helix would not be able to return the tool by a revolution in theopposite direction,therefore Ihave provided a spring, L, whose force isalways exerted to carry the tool toward the right, so as to bring itslast tooth against the inner side of the helix, whereby the helix iskept in constant engagement with the teeth of the tool to Withdraw or toadvance it. 2. Advancing the tool D in a. horizontal di- The spring isplaced ou the end of the hangrectiou, substantially as and for thepurpose ing` bracket'K, whose end is screwed into the above described. 1bottom section, H. The free end of the spring 3. In combination, thetube A, the shaft B, enters a recess made for itin thclowcr side of thetool D, toothed as described, and. the helix the tool I), au opening, J,being;` cut in the bot- I, substantially as shown. tom part, H, for thespring to play in. l I claim as new and desire to secure by Let- G. F.CASE. j ters Patentl. Enlarging the diameter ofthe bottom or Witnesses:other part of an Artesian well, substantially as S. T. POMEROY, shown.M. M. LIVINGSTON.

